Posted by Nathon on January 16, 2014 at 09:41:30 from (216.227.55.31):
I have a 400 gas start diesel. The engine has about 300 hours on it since a complete, out of frame, overhaul by me. My third one of these types of engines. Nothing was omitted during this event. Crank ground .010 over, reconditioned connecting rods, every known bearing replaced, new pistons and wrist pins, all parts boiled and thoroughly cleaned etc. It ran great with super oil pressue but now it has a knock. I have torn it apart to find that the wrist pin bushings have failed. The holes in the bushings appeared to have been properly aligned with the oil gallery in the connecting rod. I can see nothing that was assembled incorrectly. I know this is a high wear area for this type of engine, over the long term, but does anyone have any ideas why these failed so prematurely?
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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